The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
May. 18, 2021
Filed:
Sep. 09, 2014
Endress + Hauser Conducta Gesellschaft Für Mess-und Regeltechnik Mbh + Co. KG, Gerlingen, DE;
Stefan Paul, Dobeln, DE;
Stephan Buschnakowski, Chemnitz, DE;
Endress+Hauser Conducta GmbH+Co. KG, Gerlingen, DE;
Abstract
A method for determining a physical and/or chemical, temperature dependent, process variable of process automation technology utilizing a resistance thermometer (R), wherein the resistance thermometer (R) is installed in an electrical circuit, comprising the steps of: measuring a first voltage (U) across at least a first precision resistor (R); measuring a second voltage (U) across at least a second precision resistor (R); measuring a third voltage (U) across at least a third precision resistor (R), wherein cyclically or continuously a constant electrical current (I) is sent through the at least first precision resistor (R), the at least second precision resistor (R) or the at least third precision resistor (R); determining temperature coefficients (a, b, c) characteristic for the electrical circuit by means of the first voltage (U), the second voltage (U) and the third voltage (U); sending the constant electrical current (I) through the resistance thermometer (R) and measuring a voltage (U) across the resistance thermometer (R); and determining the temperature (T) by means of the temperature coefficients (a, b, c) and the measured voltage (U). An electrical circuit and a sensor of process automation technology, especially a conductivity sensor, comprising such an electrical circuit are also discussed.